Add production docker compose and deploy guide

.env.example

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+# Backend
+ASPNETCORE_ENVIRONMENT=Production
+APP_USE_HTTPS_REDIRECTION=false
+
+# JWT
+JWT_KEY=CHANGE_ME_TO_A_LONG_RANDOM_SECRET
+JWT_ISSUER=LineGestao
+JWT_AUDIENCE=LineGestao
+
+# Seed admin (first login)
+SEED_ADMIN_EMAIL=admin@seu-dominio.com
+SEED_ADMIN_PASSWORD=CHANGE_ME_TO_A_STRONG_PASSWORD
+
+# PostgreSQL
+POSTGRES_DB=linegestao
+POSTGRES_USER=linegestao_app
+POSTGRES_PASSWORD=CHANGE_ME_TO_A_STRONG_PASSWORD
+
+# Front-end URL used by CORS
+FRONTEND_PUBLIC_URL=https://seu-dominio.com

DEPLOY.md

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+# Deploy rápido (API + Postgres)
+
+## Erro: `no configuration file provided: not found`
+Esse erro acontece quando o `docker compose` é executado em uma pasta sem `docker-compose.yml`.
+
+Este repositório agora inclui `docker-compose.yml` na raiz do projeto.
+
+## Passo a passo
+
+1. Entre na pasta da API:
+
+```bash
+cd ~/apps/line-gestao-api
+```
+
+2. Crie o `.env` a partir do exemplo:
+
+```bash
+cp .env.example .env
+nano .env
+```
+
+3. Suba os containers:
+
+```bash
+docker compose up -d --build
+```
+
+4. Verifique o status e logs:
+
+```bash
+docker compose ps
+docker compose logs -f --tail=200
+```
+
+5. Teste healthcheck da API:
+
+```bash
+curl -I http://SEU_SERVIDOR:4000/health
+```
+
+## Observações
+- O Postgres **não é exposto** para fora do Docker (sem `5432:5432`).
+- A API sobe na porta `4000` do host (`4000:8080`).
+- Defina valores fortes para `JWT_KEY`, `SEED_ADMIN_PASSWORD` e `POSTGRES_PASSWORD`.

docker-compose.yml

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+services:
+  db:
+    image: postgres:16-alpine
+    container_name: linegestao-db
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: ${POSTGRES_DB:-linegestao}
+      POSTGRES_USER: ${POSTGRES_USER:-linegestao_app}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:?POSTGRES_PASSWORD is required}
+    volumes:
+      - pg_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-linegestao_app} -d ${POSTGRES_DB:-linegestao}"]
+      interval: 10s
+      timeout: 5s
+      retries: 10
+
+  api:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: linegestao-api
+    restart: unless-stopped
+    depends_on:
+      db:
+        condition: service_healthy
+    ports:
+      - "4000:8080"
+    environment:
+      ASPNETCORE_ENVIRONMENT: ${ASPNETCORE_ENVIRONMENT:-Production}
+      App__UseHttpsRedirection: ${APP_USE_HTTPS_REDIRECTION:-false}
+      ConnectionStrings__Default: Host=db;Port=5432;Database=${POSTGRES_DB:-linegestao};Username=${POSTGRES_USER:-linegestao_app};Password=${POSTGRES_PASSWORD}
+      Jwt__Key: ${JWT_KEY:?JWT_KEY is required}
+      Jwt__Issuer: ${JWT_ISSUER:-LineGestao}
+      Jwt__Audience: ${JWT_AUDIENCE:-LineGestao}
+      Seed__AdminEmail: ${SEED_ADMIN_EMAIL:?SEED_ADMIN_EMAIL is required}
+      Seed__AdminPassword: ${SEED_ADMIN_PASSWORD:?SEED_ADMIN_PASSWORD is required}
+      Cors__AllowedOrigins__0: ${FRONTEND_PUBLIC_URL:?FRONTEND_PUBLIC_URL is required}
+    healthcheck:
+      test: ["CMD", "wget", "--spider", "-q", "http://localhost:8080/health"]
+      interval: 20s
+      timeout: 5s
+      retries: 10
+      start_period: 20s
+
+volumes:
+  pg_data: